What Does C1403 Mean?
The ABS module has detected a short-to-battery (B+) condition in the right front (RF) traction control valve solenoid circuit. This indicates the solenoid circuit wiring is making contact with a positive voltage source, which can force the valve open continuously or damage the module driver. Traction control will be disabled and the warning light will illuminate.
Common Causes
40%
Wiring harness chafed against a positive voltage wire or terminal
25%
Incorrect wiring repair or aftermarket accessory cross-feeding voltage
20%
Connector pin damage causing cross-contact with adjacent power circuit
15%
ABS module internal failure with voltage backfeed on solenoid driver
Diagnostic Steps
1
Disconnect the ABS HCU connector. Using a voltmeter, check for voltage present on the RF traction control solenoid circuit pins — there should be 0V with the module disconnected. Any voltage indicates a backfeed from another source.
2
If voltage is present, disconnect the solenoid at the valve and re-check at the harness side to determine if the short is in the wiring or solenoid.
3
Trace the wiring harness and look for areas where the solenoid circuit wires may be chafed against or bundled with power supply wires. Check for damaged insulation or previous repair splices.
4
Inspect the multi-pin ABS connector for spread or damaged pins that could be cross-contacting adjacent power supply pins in the same connector.
5
If no external short is found, reconnect the harness and backprobe the solenoid driver pin at the module while commanding solenoid activation — if the module outputs constant battery voltage regardless of command state, the module is faulty.
Estimated Repair Cost
$100 - $1,200
Parts + labor, varies by vehicle and location
The ABS module has detected a short-to-battery (B+) condition in the right front (RF) traction control valve solenoid circuit. This indicates the solenoid circuit wiring is making contact with a positive voltage source, which can force the valve open continuously or damage the module driver. Tractio...
The most common cause of C1403 (Traction Control Valve RF Circuit Short To Battery) is: Wiring harness chafed against a positive voltage wire or terminal
Typical repair costs for C1403 range from $100 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Traction control is disabled. A short-to-battery condition may cause the solenoid to activate unexpectedly, potentially causing a partial brake drag on the right front wheel. This can cause uneven braking and premature pad wear. Drive carefully and have the vehicle inspected soon.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1403 to identify the root cause.
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Quick Info
Category
Chassis
System
ABS / Traction Control
Difficulty
Type
Manufacturer
Recommended Tools
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